Lagnappe is a term that originally comes from the Louisiana French. It refers to a small gift or something extra that's given to a customer after a purchase, as a little bonus or thank you. If you're looking for some synonyms for this word, there are several options. Perhaps the most common term is "bonus," which accurately conveys the idea of something extra or additional. Other options include "perk," "freebie," "goodie," "extra," "complimentary," or "add-on." Each of these words captures a slightly different nuance of the concept, but they all convey the idea of a little something extra that's provided as a gesture of good will or gratitude.